Reflector学习之特性理解

最新推荐文章于 2025-08-05 12:06:52 发布

转载最新推荐文章于 2025-08-05 12:06:52 发布 · 122 阅读

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原文链接：http://www.cnblogs.com/johnwonder/archive/2010/02/25/1673816.html

本文介绍了一个自定义属性ForeignAttribute的实现及其使用方式，并通过反射获取该属性实例来展示类LanguageTeacher的相关信息。

代码

    [AttributeUsage(AttributeTargets.All,AllowMultiple = true ,Inherited = false )]
     public class ForeignAttribute:System.Attribute
    {
         private string _languageType;

         private int _languageLevel;

         private string _languageInfo;

         // 必须定义其构造函数，如果不定义编译器提供无参默认构造函数
         public ForeignAttribute()
        {

        }

         public ForeignAttribute( string languageType, int languagelevel)
        {
            _languageType = languageType;

            _languageLevel = languagelevel;

        }

         public string LanguageType
        {

             get { return _languageType == null ? string .Empty : _languageType; }
        }

         public int LanguageLevel
        {
             get { return _languageLevel; }
        }

         public string LanguageInfo
        {
             get { return _languageInfo; }

             set { _languageInfo = value; }

        }

         public void CanSpeak()
        {
            Console.WriteLine( " He can speak {0}. " , _languageType == null ? " Chinese Only " : _languageType);

        }
    }

代码

[ReflectorDemo.Foreign( " English " , 8 ,LanguageInfo = " This is US English,but not England English " )]
      public class LanguageTeacher
    {
         public void SayHello()
        {
            Console.WriteLine( " Hello,I'm a Foreign Language teacher,I can speak Foreign Language. " );
        }
    }

     // class Program
     // {
     //     static void Main(string[] args)
     //     {
     //         Type type = typeof(LanguageTeacher);

     //         System.Reflection.MemberInfo memberinfo = type;

     //         ReflectorDemo.ForeignAttribute can = (ReflectorDemo.ForeignAttribute)Attribute.GetCustomAttribute(memberinfo,typeof(ReflectorDemo.ForeignAttribute));

     //         if (can != null)
     //         {
     //             Console.WriteLine("Class of LanguageTeacher Can Speak:" + can.LanguageType);

     //             Console.WriteLine("The English Level of LanguageTeacher is:" + can.LanguageLevel);

     //             Console.WriteLine("And," + can.LanguageInfo);
     //         }

     //          // 反射创建LanguageTeacher 对象，执行它的SayHello方法
     //         Object obj = Activator.CreateInstance(type);

     //         System.Reflection.MethodInfo mi = type.GetMethod("SayHello");

     //         mi.Invoke(obj, null);


     //     }

     // }

转自:http://www.cnblogs.com/cnliu/archive/2010/02/25/1673384.html

转载于:https://www.cnblogs.com/johnwonder/archive/2010/02/25/1673816.html